TW200521562A - Backlight module - Google Patents

Abstract

The present invention relates to a backlight module. The backlight module comprises a lamp and a diffusion sheet. The diffusion sheet is above the lamp. The diffusion sheet is for diffusing the light from the lamp. A diffraction grating is positioned on the diffusion sheet. The diffraction grating transforms the light beams coming from the lamp and lamp cover into uniform surface light source.

Description

200521562

200521562 V. Description of the invention (2) The advantages of 咼, small official diameter and long life. Cold cathode fluorescent # Ρ Μ | 1 m ^ Said wells such as r, ^ ~ u position of the lamp and the principle of inert gas such as argon (Ar), krypton (Kr) = two will fill excited argon atoms 1 The free electrons in the speech are accelerated by the electric field and mainly produce 25] 7 and then the lice atoms release the mercury atoms to release radiant energy, which generates 2 5 3,7nmm85nm two kinds of ultraviolet light (RadiatiQn), which has the largest radiation efficiency After the fluorescent body of the tube wall is excited, the formula of the glorious body can be adjusted to issue no;,,, flat, work, or partial supervision to meet the requirements of different displays. A direct-type backlight module of the first W technology can be found in the National Patent No. 5,971, 5 6 7 published on October 26, 1999. Please refer to the first figure, always: the moonlight frame 50 provides illumination for a liquid crystal display panel (not shown), and the backlight module 50 includes a plurality of u-shaped lamp tubes 44 with ', 0', and 45, 45 ', a plurality of concave reflectors 42, 42', 43, 43 ', 43' ', 43' '' and reflections located in the u-shaped lamp tube 44, ', 44 ..., and 45, ^' 3 Wall 4_6. A diffuser plate 47 is supported by the reflecting wall 46 and integrated with the backlight module 50. A filter 53 is located on the diffusion plate 47. The complex f-shaped lamp is connected to a power source (not shown). In order for the backlight module 50 to obtain the maximum output light intensity, the connecting portion of the plurality of U-shaped lamp tubes is located at the transition area of two adjacent reflectors (for example, the U-shaped lamp tube 44 is located at the junction of the reflectors 42 and 43). ). ^ However, the prior art direct type backlight module 10 has defects. Please refer to the first diagram for the light intensity distribution of the lamp. Corresponding to the light irradiation to the X2, X5, X8 and XII areas of the diffuser plate 47, the light intensity is higher than that of other areas;

200521562 Description of the five inventions (3) Light output 43, 43 ', 43 ", 43' '' sharp-convex lamp concaves that meet the predetermined requirements = emitters 42, 42 'and the following type of backlight module 10 structure the complexity. ° It is relatively complicated to add leaves. In view of this, providing a direct-type backlight module for social broadcasting μ οσ sentence is: early and the intensity of the emitted light is relatively uniform. [Abstract] The purpose of the present invention is to compare Homogeneous direct type backlight module: a simple structure and the intensity of the emitted light. The direct type of the invention is an umbrella γ y plate. The diffuser plate is located in the lamp tube at least-the lamp tube and a diffusion line. Among them, the diffuser plate is provided with the light emitted from the lamp tube. The diffuser plate with the diffraction grating is converted into a uniform sentence: The light emitted is the same as that in the prior art. A diffraction grating is provided, and the structure is simple and easy to generate the light intensity distribution of the light emitted from the lamp on the 2 diffuser plate, so that: 3 = 2 grating can change the uniformity. Light from the straight down moonlight module [Embodiment] u. Please two = three: the direct-type backlight module 100 of the present invention includes a frame = S12G, a lamp cover 13 () surrounding the lamp tube 12Q, and an expansion board 15 with a diffractive light peach 1 / l. The lamp tube 120 and the lamp cover 130 are located in the area defined by the frame and the diffusion plate 150, and the diffraction grating 5 is disposed on the side of the diffusion plate 150 opposite to the lamp tube 120. The light emitted by the lamp tube 120 and the light reflected by the lamp cover 13 are converted into a uniform surface light source by the diffusion plate 150. The lamp tube 120 can be a cold cathode fluorescent lamp.

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V. Description of the invention (4) The function of the Rong lamp cover 130 is to partially surround the lamp tube 120, and the reflection lamp tube 120 emits a light source, and sends the light source to the diffusion plate as far as possible. " The frame 1 1 0 is used to receive the lamp tube 1 2 0 and the lamp cover 1 3 0. In order to prevent the light from being refracted from the frame 110, the diffused light that is free from the frame 110 is absorbed, and the inner surface 111 of the frame 110 is formed as a black printing. The fourth image of Qing Cang's is the distribution diagram of the diffraction grating 丨 5 1 on the diffuser 丨 50 in the third image. The diffraction grating 5 1 is arranged on the diffusion plate 5 5 at intervals. Each continuous part of the diffraction grating 1 5 1 corresponds to a lamp 1 2 0, that is, the light described in the first W technology. Stronger 12, X5, χ8 & χι 1 area, because the diffuser plate directly irradiated by the lamp tube 120 is more light intensity than other areas, so the diffraction grating is set in the strong light area丨 5 1 can reduce the gap between light and dark areas, thereby improving the uniformity of light output of the diffuser 丨 50. Please refer to the fifth figure together, which is an enlarged view of a part of the diffraction grating 151 and a schematic diagram of the diffraction effect on the light emitted from the lamp tube 120. The diffraction grating 151 is a transmission-type diffraction grating, which is directly disposed on the diffusion plate 5o. The grating spacing a of the diffraction grating is 10 Am ~ 30, and the opening of the grating slit is 1 // m ~ 1 0 // m 'light officer 1 2 0 when the light exiting the diffraction grating unit, due to light Diffraction effect, its light intensity distribution has the following characteristics: In addition to the 0th-order light intensity, there are + i 卩 ratio " (not shown in the figure), and the 3rd order of the soil (not shown in the figure) on both sides of the 0th-order light intensity in the center. (Shown) ...... The eighth-order light white intensity of order η (not shown) means that the light intensity distribution area of the outgoing light extends laterally to the left and right. The cloth 150 is made of a transparent piezoelectric material, which is a transparent piezoelectric material. / Diffusion piezo-ceramic or poly-biased gas (p0yyvinylldene Flu is transparent p VDF). The diffraction grating 1 5 1 is connected to an external control circuit (not shown in the figure).

200521562 V. Description of the invention (5) Cooperative use of mechanical and electrical surfaces ^ The transparent piezoelectric material is mechanically deformed by external forces. Sale ... will be stretched, this transparent second, when used, its electrical diffraction grating] 51 will be elongated with the direction of the electrical outlet. The south, so that the voltage can be controlled according to the actual needs. Ϋ = the intensity will also increase the light intensity and uniformity of 150. The working system passes through the diffuser plate. Please also refer to the sixth figure. When working, the line is directly incident on the diffuser plate 15. Its lines and portions are also incident on the diffusion plate 150. The diffraction grating 151 will be reflected after the light diffuses and enters the diffuser plate 15 (), and the spread is equal to the strong part of the light. Xinban i50 is further improved to improve the emission. However, the direct-type backlight module of the present invention can also be implemented. The diffraction grating 50 can also use an optical film with an improved-replaced grid unit attached to the phase diffraction light 130 of the diffusion plate 150. The inner surface of the diffraction grating 130 can be plated with a highly reflective film. Shade 110-Body molding. ... and the cover 130 can be compared with the frame compared to the prior art. Since the direct-down diffuser 150 of the present invention has a diffraction grating 151, the light diffraction effect generated when the light tube 12+ emits when the light grating 151 emits makes it emit light, ^ = South, and the voltage of the transparent piezoelectric material is adjusted according to the circuit " the grating pitch of the diffraction grating 1 5 1 is controlled to control the uniformity of the light output. ^ The design configuration and process can be changed to adjust and control the Direct type backlight mode

200521562 V. Description of the invention (6) Uniformity of light output of group 100. In summary, the present invention has indeed met the requirements for invention patents, and a patent application has been filed in accordance with the law. However, the above is only a preferred embodiment of the present invention. For those who are familiar with the technology of this case, equivalent modifications or changes made in accordance with the spirit of this invention should be included in the scope of patent application below.

Page 10 200521562 Brief description of the diagram The first diagram is a schematic diagram of the structure of the back light module group of the prior art. The second diagram is the intention of the light intensity distribution of the lamp of the prior art. The first figure is a schematic view of the structure of the direct type backlight module of the present invention. The fourth figure is a schematic plan view of the diffuser plate with a diffraction grating on the second figure. The fifth figure is an enlarged view of the diffraction grating on the fourth figure. The diagram and its diffractive effect on the light emitted from the lamp tube are not intended. The sixth diagram is a schematic diagram of the light path of the direct type backlight module of the present invention. [Description of component symbols] Backlight module 100 frame 1 10 lamp tube 120 lamp cover 1 30 diffraction grating 151 diffuser 1 50

Claims (1)

200521562 Scope of patent application 1. One of at least one diffusive radiation, among which, evenly distributed 2. If applied for the lamp 3. If applied for the backlight tube. 4. If applying for the backlight and lampshade 5. If applying for the lampshade 6. If applying for the frame 7. If applying for the lampshade 8. If applying for the diffraction 1 0 // m down-type lamp tube board, the light should be expanded The light patented cold patent module backlight module includes: located above the lamp tube, which is used to diffuse a diffusion plate provided from the lamp tube and a side of the lamp tube is provided with a diffraction grating, and the lamp pipeline passes through the lamp tube. The diffusion plate of the diffraction grating is converted into a homogeneous source. The direct-type backlight module described in the first item of the scope, wherein the cathode fluorescent lamp tube. The direct-type backlight module described in the first item of the scope further includes a lampshade, which partially surrounds the direct-type backlight module described in the third patent scope of the lamp, wherein the module further includes a frame, the frame It is used for accommodating the light tube. The direct type backlight module described in item 3 of the patent scope, wherein the inner surface is covered with a reflective film. The direct type backlight module described in item 4 of the patent scope includes an inner surface, which forms a black plate. The direct type backlight module described in item 4 of the patent scope, wherein the backlight module is integrally formed with the frame. The direct type backlight module described in the first item of the patent scope, wherein the grating slit opening is 1 // m ~ 1 0 m, and the grating pitch is ~ 3 0 // m 〇 Page 12 200521562 VI. Application for patent scope 9. If applying for the diffusion 1 0. If applying for the transparent 1 1. If applying for the transparent 1 2. If applying for the diffraction 1 3. If applying for the diffraction 1 4. If applying for The diffractive film is attached 1 5. If the application is transparent 1 6. If the application is transparent 1 7. If the application is made of the diffractive direct type backlight module, in which the material of the bucket plate described in item 1 of the patent scope is a transparent fluorescent ^ ', ^ The piezoelectric material system described in the ninth item of the transparent range is described in the ninth item. F The piezoelectric material system of the ninth range of the piezoelectric material is described in the first range of the patented polyvinylidene fluoride range. The first scope of the patent scope = said external circuit phase backlight module T-type backlight module T-type backlight module Bottom-type backlight module Porcelain heart-type bottom-type backlight module " The following type of backlight module grating and-control its machinery / The grating of the diffractive grating structure described in item 1 of the direct patent range uses a two-type direct-type backlight module on the diffuser plate described in item 14 of the patent range. 2. The direct-type backlight module piezoelectric material described in item 14 of the patent scope Ethylene. The direct-type north grating described in item 14 of the patent scope, and an external circuit controlling the mechanical deformation of the moonlight mode of the optical phase, wherein of which, of which ’which are connected. 'Where optical thin' where 'where' where 'where connected. Page 13